Regulation of Gene Expression and Lac Operon
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BIOXII06: MOLECULAR BASIS OF INHERITANCE

342936 Gene regulation governing lactose operon of E.coli that involves the lac I gene product is

1 Negative and repressible because repressor protein prevents transcription
2 Feedback inhibition because excess of â-galactosidase can switch offtranscription
3 Negative and inducible because repressor protein prevents transcription
4 Positive and inducible because it can be induced by lactose
AIPMT - 2015
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342937 Read the statement regarding the lac operon and choose the correct option
I. An inducer regulates the switching on and off the lac operon
II. Repressor protein dissociated from operator
region and prevents RNA polymerase from transcribing the operon.
III. In the presence of lactose, the repressor is activated by interaction with lactose.
IV. RNA polymerase has access to the promoter and transcription proceeds only when the repressor is inactivated.

1 I and II alone are correct
2 II alone is correct
3 III and IV alone are correct
4 I and IV alone are correct
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342938 Assertion :
In prokaryotes structural gene in a transcription unit is polycistronic type.
Reason :
A single-strand of mRNA is capable of forming different polypeptide chains in prokaryotes.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342940 In
E.coli
, 'lac' operon is induced by

1 \(\beta\)-galactosidase
2 i' gene
3 Promoter gene
4 Lactose
NEET DIGITAL LIBRARY
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342936 Gene regulation governing lactose operon of E.coli that involves the lac I gene product is

1 Negative and repressible because repressor protein prevents transcription
2 Feedback inhibition because excess of â-galactosidase can switch offtranscription
3 Negative and inducible because repressor protein prevents transcription
4 Positive and inducible because it can be induced by lactose
AIPMT - 2015
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342937 Read the statement regarding the lac operon and choose the correct option
I. An inducer regulates the switching on and off the lac operon
II. Repressor protein dissociated from operator
region and prevents RNA polymerase from transcribing the operon.
III. In the presence of lactose, the repressor is activated by interaction with lactose.
IV. RNA polymerase has access to the promoter and transcription proceeds only when the repressor is inactivated.

1 I and II alone are correct
2 II alone is correct
3 III and IV alone are correct
4 I and IV alone are correct
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342938 Assertion :
In prokaryotes structural gene in a transcription unit is polycistronic type.
Reason :
A single-strand of mRNA is capable of forming different polypeptide chains in prokaryotes.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342940 In
E.coli
, 'lac' operon is induced by

1 \(\beta\)-galactosidase
2 i' gene
3 Promoter gene
4 Lactose
Join With Us for More Updates
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342936 Gene regulation governing lactose operon of E.coli that involves the lac I gene product is

1 Negative and repressible because repressor protein prevents transcription
2 Feedback inhibition because excess of â-galactosidase can switch offtranscription
3 Negative and inducible because repressor protein prevents transcription
4 Positive and inducible because it can be induced by lactose
AIPMT - 2015
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342937 Read the statement regarding the lac operon and choose the correct option
I. An inducer regulates the switching on and off the lac operon
II. Repressor protein dissociated from operator
region and prevents RNA polymerase from transcribing the operon.
III. In the presence of lactose, the repressor is activated by interaction with lactose.
IV. RNA polymerase has access to the promoter and transcription proceeds only when the repressor is inactivated.

1 I and II alone are correct
2 II alone is correct
3 III and IV alone are correct
4 I and IV alone are correct
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342938 Assertion :
In prokaryotes structural gene in a transcription unit is polycistronic type.
Reason :
A single-strand of mRNA is capable of forming different polypeptide chains in prokaryotes.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342940 In
E.coli
, 'lac' operon is induced by

1 \(\beta\)-galactosidase
2 i' gene
3 Promoter gene
4 Lactose
For More Updates join with Us
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342936 Gene regulation governing lactose operon of E.coli that involves the lac I gene product is

1 Negative and repressible because repressor protein prevents transcription
2 Feedback inhibition because excess of â-galactosidase can switch offtranscription
3 Negative and inducible because repressor protein prevents transcription
4 Positive and inducible because it can be induced by lactose
AIPMT - 2015
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342937 Read the statement regarding the lac operon and choose the correct option
I. An inducer regulates the switching on and off the lac operon
II. Repressor protein dissociated from operator
region and prevents RNA polymerase from transcribing the operon.
III. In the presence of lactose, the repressor is activated by interaction with lactose.
IV. RNA polymerase has access to the promoter and transcription proceeds only when the repressor is inactivated.

1 I and II alone are correct
2 II alone is correct
3 III and IV alone are correct
4 I and IV alone are correct
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342938 Assertion :
In prokaryotes structural gene in a transcription unit is polycistronic type.
Reason :
A single-strand of mRNA is capable of forming different polypeptide chains in prokaryotes.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect
BIOXII06: MOLECULAR BASIS OF INHERITANCE

342940 In
E.coli
, 'lac' operon is induced by

1 \(\beta\)-galactosidase
2 i' gene
3 Promoter gene
4 Lactose
NEET DIGITAL LIBRARY